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Accessory ossicles of the feet are common developmental variants with almost 40 having been described. Some of the more common include 1-4: os peroneum; os subfibulare; os subtibiale; os tibiale externum (accessory navicular) os trigonum; os calcaneus secundaris; os calcanei accessorium 6; os intermetatarseum
An os peroneum is a small accessory bone of the foot located at the lateral aspect of the cuboid within the substance of the fibularis longus tendon as it arches around the cuboid. Epidemiology. It is a very common anatomical variant, seen in up to 26% of feet 1. Differential diagnosis.
An os peroneum is a small accessory bone of the foot located at the lateral aspect of the cuboid within the substance of the fibularis longus tendon as it arches around the cuboid.
Accessory ossicles are secondary ossification centers that remain separate from the adjacent bone. They are usually round or ovoid in shape, occur in typical locations and have well-defined smooth cortical margins on all sides.
The cuboid is a wedge-shaped bone that is widest at its medial edge and narrowest at its lateral edge. It has three main articular surfaces: anterior, medial, and posterior. A vertical ridge separates its anterior surface into two facets, allowing the base of the fourth and fifth metatarsals to be articulated.
Radiographs show a medial navicular eminence that is best visualized on the lateral-oblique view. Symptomatic accessory navicular bones may appear as a 'hot spot' on bone scan and on MRI bone marrow edema can be seen. Treatment and prognosis. Acute pain can be managed by corticosteroid injection and immobilization of the foot for 2-3 weeks.
In the central navicular there is a region of watershed blood supply which predisposes the bone to stress fractures. Variant anatomy. Accessory ossicle: Present on the medial aspect of the navicular, known as an accessory navicular as result of a separate ossification center. Bipartite (rare) Development Ossification
Common accessory ossicles ot the foot: os trigonum; os supratalare ; os supranaviculare; os calcaneus secundaris; os peroneum; os vesalianum; os tibiale externum ; os intercuneiforme; os intermetatarseum
The calcaneus, also referred to as the calcaneum, (plural: calcanei or calcanea) is the largest tarsal bone and the major bone in the hindfoot. It articulates with the talus superiorly and the cuboid anteriorly and shares a joint space with the talonavicular joint, appropriately called the talocalcaneonavicular joint.
Os subfibulare is an accessory ossicle that lies at the tip of the lateral malleolus of the ankle and is rarely reported 1.